4. the characteristic
* The service life of the battery, the time spent talking and wait for answer
* How do you know when the battery
* Battery type
* To change the battery?
* How to recharge the batteries and for what period of time must be used for charging the battery
* How do you know if the battery is full
?* Supports chamnuanwon of the electrical system, so when you travel abroad, there will be problems because some countries use 110V electrical system the electrical system is used in some countries, 220V
.* The size and weight of the headphones is a big or small, heavy or light, suitable for you?
* USB cable or the battery can be charging in the car?
* Can be used in conjunction with any other device types,
?* As a Bluetooth headset that does not require a hand
* 1.1 Bluetooth technology supports the latest standards?
* Duration of warranty
* Noise protection systems, as well as having a good sound system and microphones
.* Scope of work can be used so far?
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